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What's the best practice for primary keys in tables?
...ary. Prefer a numeric type because numeric types are stored in a much more compact format than character formats. This is because most primary keys will be foreign keys in another table as well as used in multiple indexes. The smaller your key, the smaller the index, the less pages in the cache you ...
What does a tilde do when it precedes an expression?
... 0000 0000 0000 0001
If it were a negative number, it'd be stored in 2's complement: invert all bits and add 1.
...and then flips all its bits...
1111 1111 1111 1111 1111 1111 1111 1110
So what is the use of it, then? When might one ever use it?
It has a quite a few uses. If you're writin...
Is gcc's __attribute__((packed)) / #pragma pack unsafe?
In C, the compiler will lay out members of a struct in the order in which they're declared, with possible padding bytes inserted between members, or after the last member, to ensure that each member is aligned properly.
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Get file name from URI string in C#
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Also beware of a querystring. http://www.test.com/file1.txt?a=b will result in file1.txt?a=b
– Julian
Mar 10 '15 at 12:44
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Replace multiple characters in one replace call
Very simple little question, but I don't quite understand how to do it.
14 Answers
14...
Create array of regex matches
...tring> allMatches = new ArrayList<String>();
Matcher m = Pattern.compile("your regular expression here")
.matcher(yourStringHere);
while (m.find()) {
allMatches.add(m.group());
}
After this, allMatches contains the matches, and you can use allMatches.toArray(new String[0]) to g...
HTTPURLConnection Doesn't Follow Redirect from HTTP to HTTPS
I can't understand why Java's HttpURLConnection does not follow an HTTP redirect from an HTTP to an HTTPS URL. I use the following code to get the page at https://httpstat.us/ :
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Set Additional Data to highcharts series
...lt;b>' + this.point.myData + '</b>';
}
}
Full example here: https://jsfiddle.net/burwelldesigns/jeoL5y7s/
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How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
How do you convert a Unix timestamp (seconds since epoch) to Ruby DateTime?
6 Answers
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Remove CSS class from element with JavaScript (no jQuery) [duplicate]
Could anyone let me know how to remove a class on an element using JavaScript only?
Please do not give me an answer with jQuery as I can't use it, and I don't know anything about it.
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